TLV320AIC3104: HPLOUT cannot work driven by left DAC_L1 with configuration of left ADC is connected to MIC2L

Hello Alix,

I can say that your PLL settings look good, and your input/output routing seem good too. So now we need to figure out why it isn't working.

My understanding of your system is that you are taking the Digital output of the ADC, and sending to another device via DOUT, then sending it back to the AIC3104 via DIN, and you are unable to hear anything, is that correct? Can you confirm that you have signal at DIN?


best regards,
-Steve

Hi Steve,

Thanks for you immediate reply. I have already verified with the customer. He aims to configure :

MIC2L--->Left ADC---->Left DAC---->HPLOUT.

All the configuration is in  TLV320AIC3104. In addition, he can confirm that DIN has signal.

On my side, I am wondering whether we can configure MIC2L to Left ADC or not? How do you thinks?

Alix,

That is not a supported configuration.   What we can do,  is send the analog signal coming out of the PGA to the mixers to the HPLOUT.  see attached image:

use Register 49.  PGA_R to HPLUT Volume control register.  (this is assuming MIC2R as in your picture.) 

Alternately,  you could go MIC2L--->Left ADC---->DOUT---> DIN-->Left DAC---->HPLOUT.  but you can see that doesn't make a lot of sense. 

-Steve Wilson

Hi Steve,

Sorry for the misunderstanding. What the customer need is  MIC2L--->Left ADC---->DOUT---> DIN-->Left DAC---->HPLOUT.  As is shown bellow:

His configuration is:

//PLL  48KHz//
        I2C1_Write(3,0x81);            //PLL_EN=1(D7),PLL_Q=0(D6-D3),PLL_P=1(D2-D0)    
        I2C1_Write(8,0xd0);            //BCLK&WCLK output
        I2C1_Write(4,0x20);            //PLL_J=8(D7-D2)
        I2C1_Write(5,0x1e);            //PLL_D_MSB(D7-D0) D=1920-----48k
        I2C1_Write(6,0x00);            //PLL_D_LSB(D7-D2)
        I2C1_Write(11,0x01);        //PLL_R=1(D2-D0)
        delay_ms(100);

        I2C1_Write(2,0x00);            //Fs = Fs(ref)
        I2C1_Write(12,0x44);        //Left-ADC high-pass filter frequency = 0.0045 Fs,Left-DAC de-emphasis filter enabled
        I2C1_Write(17,0x0f);        //route Mic2L to the Left ADC, 0dB,
        I2C1_Write(19,0x7c);        //Left-ADC channel is powered up
        I2C1_Write(15,0x28);        //unmute Left PGA, set gain to 20 dB
        
        I2C1_Write(7,0x0A);            //Left-DAC data path plays left-channel input data
        I2C1_Write(37,0x80);        //Left DAC is powered up, HPLCOM configured as differential of HPLOUT        
        I2C1_Write(43,0x00);        //The left-DAC channel is not muted,0db
        
        I2C1_Write(47,0x80);        //DAC_L1 is routed to HPLOUT,0db
        I2C1_Write(14,0x80);        //Programs high-power outputs for ac-coupled driver configuration
        I2C1_Write(51,0x0f);        //HPLOUT is not muted,HPLOUT is fully powered up,0db

But is seems that the configuration is not work. Would you please help to find out why? 

Alix,

I have been away for the holiday.  I apologize for the delay in my response!  Can you tell me, is your customer getting Signal on the DOUT pin?  Is the AIC3104 connecting to some kind of DSP?  are you getting Signal back on the DIN pin?

please share this Application note for the TLV320AIC3104 with your customer.  It may help. I will look at their configuration and get back to you.

Best regards,

-STeve Wilson

Alix,

I was able to test the headphone outputs, using the customer's register configurations, (i did change the Fsref to 44.1khz but otherwise everything is the same) using the EVMI was able to play a file on my laptop, and listen to it using the headphone out.

can you check with your customer and get more info on what exactly the problem is?

-Steve

Hi Steve,

I am sorry the delay due to the reloaction. The problem still exists.

I am waiting more detailed response from customer on website. But based on customer's exsiting responses, it is clear that

he wants to path the signal directly from MIC2L-->PGA-->ADC-->SW-D1-->effects-->volume control-->DAC_L-->HPLOUT rather than  MIC2L-->PGA-->ADC--> Audio serial bus interface and then is processed by external DSP-->DIn --> effects-->volume control-->DAC_L-->HPLOUT.

In order to locate the HPLOUT problem, the customer debuged: using a DSP to obtain data from audio serial bus interface and check to find that the data is OK. Hence ADC works normally. Then maybe, there is something wrong with following path: SW-D1-->effects-->volume control-->DAC_L-->HPLOUT.

As you have already been able to record, and playback audio with your customers configuration, would you please tell me what  your detailed signal path is?  Is there anything we can do to help customer to debug?

Alix,

This is not supported.
SW-D1-->effects-->volume control-->DAC_L-->HPLOUT.
This path does not exist. SW-D2 is part of the digital processing for record pathSee section 10.4.2 in the data sheet. D2 and D1 close together, for this to happen the DACs must be shut down.

You can use the PGA_R or PGA_L path strait to the Output blocks, or the Line2L and Line2R direct paths.

Can you tell me why your customer would want to bother taking an analog signal into the digital domain, if all they want to do is take it strait to a DAC?

best regards,
-Steve Wilson

Hi Steve,

The customer just wants an "Analog in --- audio effect processing  --- analogy out" flow. Hence, taking an analog signal into the digital domain can use our digital process unit to do some audio effect processing. Then, they can output the processed audio signal.

Hence, they think that, he can enable SW-D1 to pass the signal to effect unit. Then the digial domain audio signal can be outputed through ADC_L.

Do you have any solution for our cusotmer to implement the funciton they want?